JP5886478B2 - Touch panel system - Google Patents

Description

  The present invention relates to a touch panel system including a touch panel, a touch panel controller, and a touch pen.

  In recent years, touch panels have become indispensable as input means to electronic devices. Touch panels are generally used as input means from relatively large devices such as televisions, monitors and whiteboards to relatively small devices such as smartphones and tablet terminals.

  And it is equipped with a dedicated touch pen that can give not only information related to the touch position but also additional information (for example, information on whether the button is pressed or writing pressure). A number of touch panel systems that can perform input with a touch pen, can realize more various inputs with higher accuracy have been proposed.

  For example, Patent Document 1 discloses a touch panel system that can accurately detect each touch position even in a state where touch operations with a plurality of electronic pens and fingers are performed simultaneously.

Japanese Published Patent Publication “Japanese Patent Laid-Open No. 2012-22543” (published on February 2, 2012)

  However, in a touch panel system that includes a dedicated touch pen and detects a touch position of a finger or the like by detecting a change in capacitance, detection of touch by the finger and detection of a signal by the dedicated touch pen can be simultaneously detected by the same mechanism. In order to achieve this, the drive timings of the dedicated touch pen and the touch panel controller that drives the touch panel need to be synchronized.

  However, in order to realize such synchronization, there is a problem that relatively large power consumption is consumed.

  An object of the present invention is to provide a touch panel system that can suppress power consumption consumed when synchronizing drive timings between a pen and a touch panel controller that drives a touch panel, and that can be driven with low power consumption.

  A touch panel system of the present invention includes a touch panel having a capacitance formed at each intersection of a plurality of first signal lines and a plurality of second signal lines, a touch panel controller, and a pen, and the capacitance described above. A touch panel system for detecting a touch position from a change in the touch panel controller, wherein the touch panel controller includes the pen and the touch panel controller on each of the plurality of first signal lines and / or each of the plurality of second signal lines. A first synchronization signal for synchronization is output, and a drive signal is output to each of one of the first signal line and the second signal line after the first synchronization signal, and in accordance with the drive signal. A detection signal for detecting the touch position is read from each of the other of the first signal line and the second signal line, and the touch position is detected. Based on the detection signal, a distance between the pen and the touch panel is calculated during a period in which the drive signal is output. When the distance is less than a predetermined value, the touch panel controller A second synchronizing signal whose driving power is smaller than the driving power for outputting the synchronizing signal is output to the first signal line and / or the second signal line after the period during which the driving signal is output. It is characterized by that.

  According to the above configuration, when the distance between the pen and the touch panel detected by the touch panel controller is less than a predetermined value, the touch panel controller drives when outputting the first synchronization signal. A second synchronization signal whose driving power is lower than the power is output to the first signal line and / or the second signal line after a period during which the driving signal is output.

  Therefore, it is possible to suppress the power consumed when synchronizing the driving timings of the pen and the touch panel controller, and to realize a touch panel system that can be driven with low power consumption.

  According to one embodiment of the present invention, it is possible to reduce power consumption consumed when synchronizing the drive timing of a pen and a touch panel controller that drives a touch panel, and to realize a touch panel system that can be driven with low power consumption.

1 is a block diagram illustrating a schematic configuration of a touch panel system according to a first embodiment. In the touch panel system according to the first embodiment, it is a diagram showing a signal waveform outputted from the touch panel controller to the drive line D ₀ to D _n, an example of a signal waveform corresponding to the drive line D _{n + 1} where the pen is driven. 2 is a diagram showing a schematic circuit configuration of a touch panel provided in the touch panel system of Embodiment 1. FIG. 2 is a diagram illustrating a schematic configuration of a stylus pen provided in the touch panel system of Embodiment 1. FIG. It is a figure which shows the correspondence of the magnitude | size of the touch reaction detected with the touchscreen controller with which the touchscreen system of Embodiment 1 was equipped, and the magnitude | size of the amplitude of the synchronous waveform detected inside the stylus pen. 2 is a diagram showing a schematic configuration of a touch panel controller provided in the touch panel system of Embodiment 1. FIG. 5 is a diagram for explaining a case where signal output thinning is performed and a case where signal output thinning is not performed in the touch panel controller provided in the touch panel system of Embodiment 1. FIG. In the control unit of the touch panel controller provided in the touch panel system according to the first embodiment, how many drive lines should be thinned out in the drive lines D _{0 to} D _n when a thinning signal is output. It is a figure for demonstrating. 6 is a diagram illustrating a schematic configuration of a touch panel controller provided in the touch panel system of Embodiment 2. FIG. (A) shows a case where a synchronization signal is output to the entire drive lines D _{0 to} D _n , and (b) shows only the drive line in the area adjacent to the touch coordinates in the drive lines D _{0 to} D _n. It is a figure which shows the case where a synchronizing signal is output. 5 is a diagram illustrating a schematic configuration of a touch panel controller provided in the touch panel system of Embodiment 3. FIG. (A) is the entire drive line _D 0 to D _n, shows a case where the voltage value at the time of rise of outputting a relatively high synchronizing signal, (b), the entire driveline _D 0 to D _n FIG. 5 is a diagram illustrating a case where a synchronization signal having a relatively low voltage value when rising is output. FIG. 10 is a diagram showing a schematic configuration of a touch panel controller provided in a touch panel system of a fourth embodiment. (A) shows a case where a synchronization signal is output to the entire drive lines D _{0 to} D _n during a normal period, and (b) shows that the drive lines D _{0 to} D _n are more than normal to the entire drive lines D _{0 to} D _n. The case where the synchronization signal is output for a short period is shown. It is a figure which shows the touchscreen and stylus pen with which the touchscreen system of Embodiment 5 was equipped. (A) shows the timing when the drive lines D _{0 to} D _n provided on the touch panel are used as drive lines, and (b) shows the sense lines S ₀ to S _k provided on the touch panel as drive lines. The timing used is shown. FIG. 10 is a diagram showing a schematic configuration of a touch panel controller provided in a touch panel system of a fifth embodiment. An example of signals output from the touch panel controller to the drive lines D _{0 to} D _n or the drive lines D ₀ ′ to D _k ′ and output waveforms corresponding to the drive lines D _{n + 1} or D ′ _{k + 1} driven by the stylus pen are shown. FIG. It is a figure which shows the case where a synchronizing signal is output only to six of drive line Dn _-2 -Dn _-7 or drive line D' _n-2 -D'n _-7 .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are merely one embodiment, and the scope of the present invention should not be construed as being limited thereto.

  The embodiment of the present invention will be described below with reference to FIGS.

[Embodiment 1]
One embodiment of the present invention is described below with reference to FIGS.
(Configuration of touch panel system)
FIG. 1 is a block diagram showing a schematic configuration of a touch panel system 1 of the present embodiment.

  As illustrated, the touch panel system 1 includes a touch panel 2, a stylus pen (touch pen) 3, and a touch panel controller 4 that drives the touch panel 2 and the stylus pen 3.

Although not shown, the touch panel 2 is provided with a plurality (n) of drive lines D _{0 to} D _n extending in the left-right direction in the drawing in parallel, and the sense line S ₀ extending in the up-down direction in the drawing. to S _m are provided in parallel a plurality (m pieces). Then, the place where the sense line S ₀ to S _m driveline D ₀ to D _n and the each of the respective intersect, the capacitance (not shown) is provided. The above m and n may be the same or different.

Then, a synchronization signal (first synchronization signal) is simultaneously output from the touch panel controller 4 to each of the drive lines D _{0 to} D _n during the synchronization period, and this synchronization signal is detected by the stylus pen 3. And the touch panel controller 4 are synchronized.

Then, the touch panel controller 4 drives each of the drive lines D _{0 to} D _n during the touch and pen input detection period, and the capacitance of the capacitance due to the touch through each of the sense lines S _{0 to} S _m . Change is to be detected.

In the present embodiment, the touch panel controller 4 drives the pen line of the stylus pen 3 with the same waveform that drives the drive line D _{n + 1} , changes the capacitance on the touch surface of the touch panel 2, Through the sense lines S _{0 to} S _m , the change in the capacitance is detected, and additional information such as whether or not the button provided on the stylus pen 3 is pressed by the user and writing pressure. Is detected by the touch panel controller 4. Further, if the waveform is used for other than the drive line connected to the sensor, the waveform for driving the pen tip does not necessarily have to be D _{n + 1} such as D _{n + 2} . For example, when the sensor is driven by the drive lines D _{1 to} D _{n + 1} , the pen tip may be driven with a waveform corresponding to D ₀ , or the pen tip may be driven with a waveform after D _{n + 2} .

  As will be described in detail later, the distance between the touch panel 2 and the stylus pen 3 can be calculated by the touch panel controller 4 from the change in capacitance due to the touch.

FIG. 2 is a diagram illustrating a signal waveform output from the touch panel controller 4 to the drive lines D _{0 to} D _n and a signal waveform D _{n + 1} for driving the pen tip of the stylus pen 3.

As shown in the figure, the same synchronization signal (first synchronization signal) is output from the touch panel controller 4 to the drive lines D _{0 to} D _n during the synchronization period, while the touch and pen input detection period is being performed. The drive signals are sequentially output to the drive lines D _{0 to} D _n . That is, during the touch and pen input detection period, the timing at which the drive signal of the drive line D _n-1 becomes Low from High, so that the drive signal of the next drive line D _n becomes High from Low .

At the timing of D _{n + 1} shown in the figure, the pen tip of the stylus pen 3 is driven to change the capacitance on the touch surface of the touch panel 2 and the above-described sense lines S _{0 to} S _m are used to The touch panel controller 4 detects a change in capacitance, and detects additional information such as whether or not a button provided on the stylus pen 3 is pressed by the user and writing pressure.

In the present embodiment, as shown in the figure, the drive lines D _{0 to} D _n and the pen tip using the signal waveform corresponding to D _{n + 1} are sequentially driven. As will be described, using M-sequence signals, Hadamard code strings, and the like as code strings, driving of drive lines D _{0 to} D _n and driving of a pen tip using a signal waveform corresponding to D _{n + 1} are parallel. In the case of using parallel drive, the position of the detection target may be detected from the correlation value obtained by performing the correlation calculation of the code string, and the code string restoration calculation is performed. The position of the detection object may be detected from the restoration value.

When driving the drive lines D _{0 to} D _n and driving the pen tip using the signal waveform corresponding to D _{n + 1} , the number of sensing times (number of integrations) can be increased. A touch panel that improves the S / N ratio and performs position detection with high accuracy can be realized.
(Configuration of touch panel)
FIG. 3 is a diagram illustrating a schematic circuit configuration of the touch panel 2 provided in the touch panel system 1.

As shown in the drawing, a plurality (n) of drive lines D _{0 to} D _n extending in the left-right direction in the drawing are provided in parallel, and cross the drive lines D _{0 to} D _n in the drawing. A plurality of (m) sense lines S _{0 to} S _m extending in the vertical direction are provided in parallel. Capacitances C _{00 to} C _nm are provided at locations where the drive lines D _{0 to} D _n and the sense lines S _{0 to} S _m intersect. The above m and n may be the same or different.

Then, the stylus pen 3 detects the synchronization signal output from the touch panel controller 4 to each of the drive lines D _{0 to} D _n by being close to the touch surface of the touch panel 2, and is synchronized with the touch panel controller 4.

Then, the touch panel controller 4 drives each of the drive lines D _{0 to} D _n during the touch and pen input detection period shown in FIG. 2 and performs the above-described touch operation via the sense lines S _{0 to} S _m. A change in capacitance is detected, and a touch position and / or a distance between the touch panel 2 and the stylus pen 3 is calculated.

In the present embodiment, the pen tip of the stylus pen 3 is driven with a waveform corresponding to the drive line D _{n + 1} to change the capacitance on the touch surface of the touch panel 2, and each sense line S _{0 to} S The change in the capacitance is detected via _m , and the touch panel controller 4 detects additional information such as whether or not a button provided on the stylus pen 3 is pressed by the user and writing pressure. It has become.

(Structure of stylus pen and pressure sensor function)
The stylus pen 3 of the present embodiment has, for example, a writing pressure sensor for detecting writing pressure, and a writing pressure signal from the writing pressure sensor is output while synchronizing with the touch panel controller 4. It is like that. However, the stylus pen 3 is not necessarily limited thereto, and may not include a writing pressure sensor for detecting writing pressure.

  FIG. 4 is a cross-sectional view showing the configuration of the stylus pen 3.

  As shown in FIG. 4, the stylus pen 3 includes a pen body 5 that is held by a user and has a conductive grip portion 5 a formed in a substantially cylindrical shape so that the user can hold it by hand. A pen tip portion 6 that is pressed against the touch panel 2 at the time of a touch operation is provided at the tip of.

  The pen tip portion 6 is provided on the back side of the pen tip shaft 6b, a pen tip shaft 6b, insulators 6c and 6c that hold the pen tip cover 6a in an axially movable manner, and a pen tip shaft 6b. A writing pressure sensor 6d.

  The pen tip cover 6a is made of an insulating material, and the pen tip shaft 6b is made of a conductive material, for example, a metal or a conductive synthetic resin material.

  The writing pressure sensor 6d is made of, for example, a semiconductor piezoresistive pressure sensor, and a semiconductor strain gauge is formed on the surface of a diaphragm (not shown). Therefore, when the pen tip cover 6a of the pen tip portion 6 is pressed against the touch panel 2 during the touch operation, the pen tip shaft 6b is pushed through the pen tip cover 6a to press the surface of the diaphragm of the writing pressure sensor 6d, Thereby, a change in electric resistance due to the piezoresistance effect generated by the deformation of the diaphragm is converted into an electric signal. Thereby, the writing pressure in the stylus pen 3 can be detected. Furthermore, the principle of pen pressure detection is not necessarily limited to this, and other detection principles can be employed.

  The pen body 5 includes a connection switch 7, a control circuit 8, operation change-over switches 9 a and 9 b, a sense circuit 10, a synchronization signal detection circuit 11, a timing adjustment circuit 12, and a drive circuit 13. Is provided. Furthermore, the connection switch 7 can be omitted. When the connection switch 7 is omitted, the output of the control circuit 8 is connected to the pen tip shaft 6b.

  The connection switch 7 is an electronic switch composed of a field effect transistor (FET) or the like, and is on / off controlled by the control circuit 8. Here, when the connection switch 7 is off, the pen tip cover 6 a is electrically disconnected from the grip portion 5 a of the pen body 5. At this time, since the component capacity of the pen tip portion 6 is extremely small, the touch panel system 1 does not recognize the proximity / contact of the stylus pen 3 even if the pen tip cover 6 a is brought close to the touch panel 2.

On the other hand, when the connection switch 7 is turned on, the pen tip cover 6a is electrically connected to the grip portion 5a of the pen body 5 via the pen tip shaft 6b, and the human body is connected to the pen tip cover 6a via the grip portion 5a. Conduct. Accordingly, since the human body has a relatively large capacitance, when the stylus pen 3 approaches or comes into contact with the touch panel 2, the charges accumulated in the capacitances C _{00 to} C _nn of the touch panel 2 change. The touch panel system 1 can detect the touch state of the stylus pen 3.

  The stylus pen 3 is provided with, for example, a push-type first operation switch 14a and a second operation switch 14b. By pressing the first operation switch 14a and the second operation switch 14b, the first operation switch 14a and the second operation switch 14b are pressed. The functions assigned to the first operation switch 14 a and the second operation switch 14 b are executed via the control circuit 8. Examples of the function assigned to the first operation switch 14a include an eraser function. The eraser function can be turned on / off with the first operation switch 14a. Further, as a function assigned to the second operation switch 14b, for example, a right click function of the mouse can be cited, and the right click function of the mouse can be turned on / off by the second operation switch 14b. is there.

  Furthermore, the eraser function and the right click function of the mouse are only examples, and are not limited to the eraser function and the right click function of the mouse. It is also possible to add other functions by providing other operation switches.

  The touch position of the stylus pen 3 on the touch panel 2 is detected by touching the stylus pen 3 on the touch panel 2 with the connection switch 7 of the stylus pen 3 turned on.

In the present embodiment, in order to detect the driving of the pen tip unit 6 in the stylus pen 3 by the touch panel controller 4, the pen tip of the stylus pen 3 is driven with a waveform corresponding to the drive line D _{n + 1} or the like, and the touch panel 2. The capacitance on the touch surface is changed, the change in the capacitance is detected via each of the sense lines S _{0 to} S _m, and the button provided on the stylus pen 3 by the user is pressed The touch panel controller 4 detects additional information such as the status and writing pressure.

(Basic operation of synchronization between touch panel controller and stylus pen)
By the way, the stylus pen 3 of the present embodiment transmits and receives signals to and from the touch panel controller 4 wirelessly. Therefore, the pen tip 6 is driven in the same pattern as driving the virtual drive line D _{n + 1} so as to match the drive timing of the drive lines D _{0 to} D _n in the touch panel controller 4. In view of this, the stylus pen 3 is provided with a drive circuit 13 so as to be driven in the same manner as the driver of the touch panel controller 4.

The drive lines D _{0 to} D _n in the touch panel controller 4 are driven based on the drive timing generated by the timing generator 17 (FIG. 6). For this reason, the stylus pen 3 must also be operated in synchronization with the timing when the touch panel controller 4 is driven. Therefore, in the stylus pen 3 of the present embodiment, by providing the sense circuit 10, the synchronization signal detection circuit 11, and the timing adjustment circuit 12, the stylus pen 3 detects a dedicated synchronization signal driven by the touch panel controller 4, The timing of the dedicated synchronization signal of the touch panel controller 4 and the timing of the pen synchronization signal generated by the timing adjustment circuit 12 in the stylus pen 3 are made to coincide.

  In the stylus pen 3, the sense circuit 10 and the synchronization signal detection circuit 11 detect the dedicated synchronization signal generated by the timing generator 17 (FIG. 6) of the touch panel controller 4.

  Note that the driving operation of the stylus pen 3 is a synchronization for detecting the synchronization signal from the touch panel controller 4 by the sense circuit 10 and the synchronization signal detection circuit 11 with the operation switch 9a turned on and the operation switch 9b turned off. The signal detection period, the preparation period, and the operation changeover switch 9a are turned off, and the operation changeover switch 9b is turned on and the drive circuit 13 drives the pen tip unit 6 to drive the pen tip unit 6 to be configured by repeating three periods. Yes.

  The synchronization signal detection period is a waiting period for detecting a bit pattern representing a synchronization waveform, and is a period in which the drive of the pen tip unit 6 is turned off and a synchronization signal pattern is detected from the pen tip signal waveform.

  The preparatory period is a preparatory period for starting to drive the pen tip in synchronization with the touch panel controller 4 after detecting the synchronization signal pattern, and is a period for interpreting additional information that takes a drive start timing.

  The drive mode period is a period in which the pen tip section 6 is driven by the drive circuit 13 and is a period in which the pen tip section 6 is driven while finely adjusting the edge of the drive waveform so as to match the drive timing of the touch panel controller 4. is there. At this time, the drive circuit 13 of the stylus pen 3 is driven in accordance with the drive timing of the touch panel controller 4.

  FIG. 5 is a diagram illustrating a correspondence relationship between the magnitude of the synchronization signal detected by the stylus pen 3 and the magnitude of the touch response of the stylus pen 3 to the touch panel 2 detected by the touch panel controller 4.

  FIG. 5A is a diagram showing a case where the touch surface of the touch panel 2 and the stylus pen 3 are relatively far apart. In such a case, the stylus pen 3 hardly detects the waveform of the synchronization signal. . Then, the magnitude of the touch response of the stylus pen 3 to the touch panel 2 detected by the touch panel controller 4 is also determined as having no touch reaction because the touch surface of the touch panel 2 and the stylus pen 3 are relatively far apart.

  FIG. 5B is a diagram illustrating a case where the touch surface of the touch panel 2 and the stylus pen 3 are relatively close to each other. In such a case, the stylus pen 3 detects a waveform of a small synchronization signal. . Then, the magnitude of the touch response of the stylus pen 3 to the touch panel 2 detected by the touch panel controller 4 is determined to be a small touch response because the touch surface of the touch panel 2 and the stylus pen 3 are relatively close to each other.

  FIG. 5C is a diagram showing a case where the touch surface of the touch panel 2 and the stylus pen 3 are in contact with each other. In such a case, the stylus pen 3 detects a waveform of a large synchronization signal. . Then, the magnitude of the touch reaction of the stylus pen 3 to the touch panel 2 detected by the touch panel controller 4 is determined to be a large touch reaction because the touch surface of the touch panel 2 and the stylus pen 3 are in contact with each other.

The magnitude of the touch response of the stylus pen 3 to the touch panel 2 detected by the touch panel controller 4, that is, the distance between the touch panel 2 and the stylus pen 3 is determined during the touch and pen input detection period shown in FIG. The drive lines D _{0 to} D _n are driven, and the capacitance change due to the touch is detected and calculated through the sense lines S _{0 to} S _m .

  FIG. 6 is a diagram illustrating a schematic configuration of the touch panel controller 4 provided in the touch panel system 1.

  As illustrated, the touch panel controller 4 includes a drive line drive circuit 15, a sense amplifier 16, a timing generator 17, a control unit 18, an AD converter 19, and a processing unit 20. Yes.

The drive line drive circuit 15 is a circuit that outputs the synchronization signal generated based on the clock signal CL generated by the timing generator 17 and the drive signal to each of the drive lines D _{0 to} D _n .

The sense amplifier 16 is a circuit that acquires capacitance data via the sense lines S _{0 to} S _m based on the clock signal CL generated by the timing generator 17 and the drive signal, and sends the capacitance data to the AD converter 19. It is.

  In the timing generator 17, a clock signal CL and a synchronization signal are generated based on the clock signal CL, and sent to the drive line driving circuit 15, the sense amplifier 16, the control unit 18, and the like.

  In the AD converter 19, the capacity data is converted into digital data and then sent to the processing unit 20.

  In the processing unit 20, information on the touch position, the magnitude of the touch response of the stylus pen 3 to the touch panel 2, that is, information that can be converted from the capacity data into the distance between the touch panel 2 and the stylus pen 3. Further, additional information such as whether or not a button provided on the stylus pen 3 by the user is pressed and writing pressure is detected.

  Then, the control unit 18 determines whether to output a thinning signal to the drive line driving circuit 15 based on touch response magnitude data (information on the distance between the touch panel 2 and the stylus pen 3). That is, if the touch response magnitude data is equal to or greater than a predetermined value, a thinning signal is output, and if the touch response magnitude data is less than the predetermined value, the touch response magnitude data is output without being thinned.

  Therefore, when the magnitude data of the touch response is equal to or greater than a predetermined value, that is, when the distance between the touch panel 2 and the stylus pen 3 is closer than the predetermined value, a new synchronization signal (first count) thinned out from the drive line driving circuit 15 is obtained. 2 synchronization signals) is output.

  Further, the processing unit 20 performs processing corresponding to the determined input operation based on the capacity data regarding the touch position, the magnitude data of the touch response, and the additional information.

  FIG. 7 is a diagram for explaining the case where the synchronization signal output is thinned out and the case where it is not performed in the control unit of the touch panel controller 4 provided in the touch panel system 1.

FIG. 7A shows a case where the control unit 18 outputs without thinning out. In such a case, a synchronization signal is output to each of the drive lines D _{0 to} D _n , and the touch panel is displayed. When the touch surface 2 and the stylus pen 3 are in contact with each other, the stylus pen 3 detects a waveform of a large synchronization signal.

On the other hand, FIG. 7B shows a case where the control unit 18 outputs a thinning signal. In such a case, the synchronization signal is output only to a predetermined drive line determined in advance. In the present embodiment, so that the in driveline D ₀ to D _n, only the synchronization signal to even rows of drive lines is output. For this reason, even when the touch surface of the touch panel 2 and the stylus pen 3 are in contact, the waveform of the synchronization signal detected by the stylus pen 3 is relatively small. However, even a waveform of such a relatively small synchronization signal exceeds a predetermined reference value and can be detected by the sense circuit 10 and the synchronization signal detection circuit 11 of the stylus pen 3.

In the present embodiment, the sync signal is output only to the even-numbered drive lines among the drive lines D _{0 to} D _n , but the present invention is not limited to this. A synchronization signal may be output only to the drive line. Furthermore, if the stylus pen 3 can detect a synchronization signal having a predetermined intensity or more regardless of the position on the touch surface of the touch panel 2, J of I The drive line may be thinned out at an arbitrary ratio such as thinning out (I> J).

FIG. 8 is a diagram for explaining how many drive lines should be thinned among the drive lines D _{0 to} D _n when the control unit 18 outputs a thinning signal.

FIG. 8A shows the touch panel controller 4 that drives each of the drive lines D _{0 to} D _n during the touch and pen input detection period, and touches each of the sense lines S _{0 to} S _m. It is a figure which shows the relationship between the magnitude | size data of the touch reaction detected based on the change of the said electrostatic capacitance, and the height (distance of the stylus pen 3 and the touch panel 2) of a hover.

  The magnitude data of the touch reaction detected by the touch panel controller 4 and the height of the hover (distance between the stylus pen 3 and the touch panel 2) are associated as illustrated.

Figure 8 (b) is a diagram showing a relationship between the amplitude and the hover height of the synchronizing signal received at the pen tip of stylus pen 3 (the distance between the stylus pen 3 and the touch panel 2), the drive lines D ₀ ~ As the number of synchronization signals output decreases during D _n , the height of the hover at which the synchronization signal can be detected tends to decrease.

Hereinafter, based on FIG. 8B, how many drive lines should be thinned out among the drive lines D _{0 to} D _n will be described.

  First, a range (hover detection range) A in which the approach of the stylus pen 3 is desired to be detected and a range B to be used in the touch operation are determined.

  Then, a synchronization signal amplitude range C that can be stably detected in synchronization is obtained from the characteristics of the touch panel system 1.

Then, the range (hover detection range) A in which the approach of the stylus pen 3 in the figure is to be detected and the range C of the synchronization signal amplitude that can be stably detected in synchronization, the range B that is used in the touch operation, and the synchronization can be detected stably. From the range C of the sync signal amplitude, it is possible to determine how many drive lines can be thinned out of the drive lines D _{0 to} D _n to which the sync signal is output.

  That is, the minimum number that can be thinned out can be determined from the range A and the range C in the drawing, and the maximum number that can be thinned out can be determined from the range B and the range C in the drawing.

  In the control unit 18 provided in the touch panel controller 4, the number of thinned-out signals is determined from touch response magnitude data, which is data related to the height of the hover (distance between the stylus pen 3 and the touch panel 2), and the thinned-out signal is driven to the drive line. It outputs to the drive circuit 15 (refer FIG. 6).

  If the height of the hover (distance between the stylus pen 3 and the touch panel 2) is within a range B used for touch operation, a thinning signal for driving only Q drive lines out of P is output to the drive line drive circuit 15 To do.

  On the other hand, if the height of the hover (distance between the stylus pen 3 and the touch panel 2) is not less than the range B used for touch operation and less than the range (hover detection range) A where the approach of the stylus pen 3 is desired to be detected, I A thinning signal for driving only J drive lines is output to the drive line driving circuit 15.

  If the height of the hover (distance between the stylus pen 3 and the touch panel 2) is equal to or greater than the range (hover detection range) A in which the approach of the stylus pen 3 is desired to be detected, a thinning signal for driving all the drive lines is sent to the drive line. Output to the drive circuit 15.

  By using such a configuration, the stylus pen 3 and the touch panel controller 4 are stably synchronized, and the drive timing of the stylus pen 3 and the touch panel controller 4 that drives the touch panel 2 is synchronized. The touch panel system 1 that can suppress power consumption and can be driven with low power consumption can be realized.

In FIG. 8B, I and J, and P and Q are values related to the drive lines D _{0 to} D _n in this embodiment, so that I ≦ n, J ≦ n, and I > J, P> Q, and P / Q> I / J depending on the signal strength.

  Depending on the height of the hover (distance between the stylus pen 3 and the touch panel 2), the number of drive lines for outputting a synchronization signal is arbitrarily set to be between J out of I and Q out of P. The changing configuration can be realized using a function or a lookup table.

[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the touch panel controller 4a of the touch panel system according to the present embodiment, which region of the drive lines D _{0 to} D _{n is} to be thinned is determined based on the magnitude of the touch response from the processing unit 20 and the coordinate data. The present embodiment is different from the first embodiment in that the controller 18a is provided. Other configurations are as described in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 9 is a diagram showing a schematic configuration of the touch panel controller 4a provided in the touch panel system of the present embodiment.

  As shown in the drawing, the control unit 18a provided in the touch panel controller 4a receives the touch reaction magnitude data (distance between the stylus pen 3 and the touch panel 2) detected from the processing unit 20 from the change in capacitance due to the touch. ).

Then, as long as the size of the touch reaction can be detected touch coordinates, also receives touch coordinates data from the processing unit 20, in the drive line D ₀ to D _n, the driveline of a region adjacent to the touch coordinate data Only a thinning signal for outputting a synchronization signal is output to the drive line driving circuit 15.

FIG. 10A shows a case where a synchronization signal is output to the entire drive lines D _{0 to} D _n , and FIG. 10B shows an area adjacent to the touch coordinates in the drive lines D _{0 to} D _n . It is a figure which shows the case where a synchronizing signal is output only to a drive line.

In the following, it will be described in detail how many sync lines should be output to the drive lines D _{0 to} D _n around the touch coordinates.

  First, based on the specifications of the touch panel system, it is determined to what extent the movement of the stylus pen 3 should correspond to the movement of the touch position.

Then, based on the period of the synchronization period and the above speed, how many drive lines D _{0 to} D _{n the} stylus pen 3 may move before the next synchronization period is calculated.

Specifically, the synchronization period is 1 msec, the touch and pen input detection period is 9 msec (see FIG. 2), the moving speed of the stylus pen 3 is 1000 mm / sec (the stylus to be supported based on the specifications of the touch panel system) _If the pitch of the drive line D _{0 to} D _n is 5 mm, the next touch coordinate detected after 10 msec from the first detected touch coordinate of the stylus pen 3 is the drive line D _0. the possibility that moves by two pins of to D _n.

Accordingly, as shown in FIG. 10B, when the touch coordinates detected first of the stylus pen 3 are between the drive line D _m-1 and the drive line D _m , the drive line D _{m- It} is only necessary to output the synchronization signal to 6 lines from ₃ to the drive line _{Dm + 2} .

  By using such a configuration, the stylus pen 3 and the touch panel controller 4a are stably synchronized, and the drive timing of the stylus pen 3 and the touch panel controller 4a that drives the touch panel 2 is synchronized. A touch panel system that can suppress power consumption and can be driven with low power consumption can be realized.

  In addition, since the structure of this Embodiment can be used when the stylus pen 3 approaches the touch surface of the touch panel 2 to such an extent that touch coordinates can be detected, it can also be combined with the above-described Embodiment 1. In the configuration in which the number of drive lines that output the synchronization signal is changed in a plurality of stages, the number of drive lines that output the synchronization signal can be used as the minimum stage.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described with reference to FIGS. The touch panel controller 4b of the touch panel system of the present embodiment is different from the above-described first and second embodiments in that it includes a control unit 18b that adjusts the voltage of the synchronization signal. Other configurations are as described in the first and second embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 and 2 are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 11 is a diagram showing a schematic configuration of the touch panel controller 4b provided in the touch panel system of the present embodiment.

  As shown in the figure, the control unit 18b provided in the touch panel controller 4b is a touch reaction magnitude data (distance between the stylus pen 3 and the touch panel 2) detected from the change in capacitance due to the touch from the processing unit 20. And outputs a voltage adjustment signal for adjusting the voltage of the synchronization signal to the drive line drive circuit 15 in accordance with the magnitude of the touch response.

FIG. 12A shows a case where a synchronizing signal having a relatively high voltage value when rising is output to the entire drive lines D _{0 to} D _n , and FIG. 12B shows the drive line D _0. throughout to D _n, it is a diagram showing a case where the voltage value at the time of rise of outputting a relatively low sync signal.

  As shown in the figure, in the case of FIG. 12B, the magnitude of the waveform of the synchronization signal detected by the stylus pen 3 is smaller than that in the case of FIG. The standard value is exceeded.

  As described above, within the range in which the stylus pen 3 and the touch panel controller 4b can be stably synchronized, the voltage value of the synchronization signal is lowered, and the synchronization signal whose voltage value is relatively low when it rises (at the time of High). By outputting, while stably synchronizing the stylus pen 3 and the touch panel controller 4b, the power consumption consumed when synchronizing the drive timing of the stylus pen 3 and the touch panel controller 4b for driving the touch panel 2 is suppressed. It is possible to realize a touch panel system that can be driven with low power consumption.

  Note that the configuration of this embodiment can also be used in combination with Embodiments 1 and 2 described above. Further, the number of drive lines in FIG. The relationship between the amplitude of the synchronization signal newly received by the pen tip of the stylus pen 3 and the height of the hover (distance between the stylus pen 3 and the touch panel 2) is obtained, and the magnitude data of the touch response (stylus pen) Depending on the distance between the touch panel 2 and the touch panel 2, the step of decreasing the voltage value of the synchronization signal may be made into a plurality of steps.

[Embodiment 4]
Next, a fourth embodiment of the present invention will be described based on FIGS. The touch panel controller 4c of the touch panel system of the present embodiment is different from the above first to third embodiments in that it includes a control unit 18c that outputs a drive pattern selection signal of a synchronization signal. Other configurations are as described in the first to third embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 13 is a diagram showing a schematic configuration of a touch panel controller 4c provided in the touch panel system of the present embodiment.

  As shown in the drawing, the control unit 18c provided in the touch panel controller 4c is a touch reaction magnitude data (distance between the stylus pen 3 and the touch panel 2) detected from the change in capacitance due to the touch from the processing unit 20. And outputs a drive pattern selection signal of a synchronization signal for selecting a drive pattern of the synchronization signal to the drive line drive circuit 15 according to the magnitude of the touch reaction.

  Specifically, when the magnitude of the touch response is equal to or greater than a predetermined value, a synchronization signal drive pattern that shortens the output period of the synchronization signal is selected.

FIG. 14A shows a case where a synchronization signal is output to the entire drive lines D _{0 to} D _n during a normal period, and FIG. 14B shows the entire drive lines D _{0 to} D _n. The case where the synchronization signal is output for a period shorter than usual is shown.

  As shown in the drawing, in the case of FIG. 14B, the magnitude of the waveform of the synchronization signal detected by the stylus pen 3 is smaller than that in the case of FIG. The standard value is exceeded.

  Accordingly, the stylus pen 3 and the touch panel controller 4c are selected by selecting a drive pattern of the synchronization signal for outputting the synchronization signal for a shorter period of time within a range in which the stylus pen 3 and the touch panel controller 4b can be stably synchronized. The touch panel system that can be driven with low power consumption can be achieved by suppressing the power consumption when synchronizing the drive timing of the stylus pen 3 and the touch panel controller 4c that drives the touch panel 2 while stably synchronizing can do.

  Note that the configuration of this embodiment can also be used in combination with the above-described first to third embodiments, and further, the number of drive lines driven in FIG. Then, the relationship between the amplitude of the synchronization signal newly received by the pen tip of the stylus pen 3 and the height of the hover (distance between the stylus pen 3 and the touch panel 2) is obtained, and touch response magnitude data (stylus pen 3 and Depending on the distance to the touch panel 2, the step of shortening the output period of the synchronization signal may be made into a plurality of steps.

  In addition, as described above, when the driving pattern of the synchronization signal that shortens the output period of the synchronization signal is selected and the synchronization period becomes shorter, the time until the touch detection operation starts may be set as the waiting time. You may set so that a touch detection operation may be started immediately without waiting.

  If the waiting time until the start of the touch detection operation is set as a waiting time, an effect of reducing power consumption can be obtained, and if the touch detection operation is set to start immediately without waiting, the touch detection operation An effect of shortening the cycle, that is, an effect of obtaining touch coordinates more frequently can be obtained.

When an M-sequence waveform is used as the synchronization signal waveform, for example, when the length of the original waveform is based on 2 ^N -1 bits of M-sequence data, a shorter pattern is used. Becomes a waveform based on data of the number of bits such as 2 ^N-1 -1, 2 ^N-2 -1.

[Embodiment 5]
Next, a fifth embodiment of the present invention will be described based on FIGS. In the touch panel system of the present embodiment, in that it is configured that the driveline D ₀ to D _n and the sense line S ₀ to S _k detects a touch position while interchange at a predetermined period, the above embodiment Different from 1-4. Other configurations are the same as those described in the first to fourth embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 4 are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 15 is a diagram showing the touch panel 2 and the stylus pen 3 provided in the touch panel system of the present embodiment.

As illustrated, the driveline _D 0 to D _n and the sense line _S 0 to S _k provided on the touch panel 2, replaced with a constant period, the drive line _D 0 to D _n is the sense line _{S 0} '~ S _n ′, and the sense lines S _{0 to} S _k become drive lines D ₀ ′ to D _k ′. Note that k and n may be the same or different.

FIG. 16A shows the timing when the drive lines D _{0 to} D _n provided on the touch panel 2 are used as drive lines, and FIG. 16B shows the sense lines S ₀ to S provided on the touch panel 2. The timing at which S _k is used as a drive line is shown.

In the present embodiment, the stylus pen 3 is output from the touch panel controller 21 to the drive lines D _{0 to} D _n or the drive lines D ₀ ′ to D _k ′ by approaching the touch surface of the touch panel 2. The stylus pen 3 detects the synchronized signal, and the touch panel controller 21 and the stylus pen 3 are synchronized.

Then, the touch panel controller 21 drives each drive line D _{0 to} D _n (D ₀ ′ to D _k ′) and detects each sense line S _{0 to} S _k (S) during the touch and pen input detection period. ₀ ′ to S _n ′), the change in the capacitance due to the touch is detected.

In the present embodiment, the pen tip of the stylus pen 3 is driven with a waveform corresponding to the drive line D _{n + 1} or D ′ _{k + 1,} etc., and the capacitance on the touch surface of the touch panel 2 is changed to detect each sense. The change in electrostatic capacitance is detected via the lines S _{0 to} S _k (S ₀ ′ to S _n ′), and whether the button provided on the stylus pen 3 by the user is pressed or the writing pressure The touch panel controller detects additional information such as.

  The distance between the touch panel 2 and the stylus pen 3 can be calculated by the touch panel controller 21 from the change in capacitance due to touch.

  FIG. 17 is a diagram showing a schematic configuration of the touch panel controller 21 provided in the touch panel system of the present embodiment.

  As shown, the touch panel controller 21 includes an AD converter 19, a processing unit 20, a multiplexer 22, a drive line driving circuit 23, a sense amplifier 24, a timing generator 25, and a control unit 26. Is provided.

The multiplexer 22 changes the target line connected to the drive line drive circuit 23 from the drive lines D _{0 to} D _n (D ₀ ′ to D _k ′) to the drive lines D ₀ ′ to D _k ′ (D ₀ to At the same time as switching to D _n ), the target lines connected to the sense amplifier 24 are changed from the sense lines S _{0 to} S _k (S ₀ ′ to S _n ′) to the sense lines S ₀ ′ to S _n ′ (S _{0 to} S _k). ).

  That is, the multiplexer 22 is a connection switching circuit that switches connections between a plurality of inputs and a plurality of outputs.

FIG. 18 is a diagram illustrating an example of signals output from the touch panel controller 21 to the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′.

As shown, the drive lines D _{0 to} D _n (sense lines S ₀ ′ to S _k ′) and the drive lines D ₀ ′ to D _k ′ (sense lines S _{0 to} S _n ) are touched and A signal in which the pen input detection period and the sensing period are alternately present at a predetermined period is output.

In FIG. 18, the synchronization waveform is also detected in the synchronization period immediately after the touch and pen input detection period (immediately before the sensing period). In the present embodiment, this is the drive line drive circuit 23. Since the multiplexer 22 is used to output the synchronization signal from the drive line D _{0 to} D _n and the drive line D ₀ ′ to D _k ′, the synchronization signal is output. is there.

Note that it is not always necessary to output the synchronization signal to all of the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′. The drive lines D _{0 to} D _n and the drive lines D ₀ ′ to A synchronizing signal may be alternately output with D _k ′.

  As illustrated in FIG. 17, the control unit 26 provided in the touch panel controller 21 receives the touch response magnitude data (the distance between the stylus pen 3 and the touch panel 2) from the processing unit 20, and the touch response If the size is such that touch coordinates can be detected, touch coordinate data is also received from the processing unit 20.

Then, the control unit 26 outputs a thinning signal for outputting a synchronization signal only to the drive line in the area adjacent to the touch coordinates in the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′. To 23.

Hereinafter, how many drive lines should be output to the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′ centered on the touch coordinates will be described in detail.

  First, based on the specifications of the touch panel system, it is determined to what extent the movement of the stylus pen 3 should correspond to the movement of the touch position.

  Then, based on the period of the synchronization period and the above speed, how many drive lines the stylus pen 3 may move before the next synchronization period is calculated.

More specifically, the synchronization period is 1 msec, the touch and pen input detection period is 9 msec, the movement speed of the stylus pen 3 is 1000 mm / sec (the maximum movement of the stylus pen 3 to be supported based on the specifications of the touch panel system) Speed), if the pitch of the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′ is 5 mm, the drive lines D _{0 to} D _n and the sense lines S _{0 to} S _k are used to The next touch coordinates detected after 10 msec using the drive lines D ₀ ′ to D _k ′ and the sense lines S ₀ ′ to S _n ′ from the first detected touch coordinates are the drive lines D _{0 to} D _n. In addition, there is a possibility of moving by two drive lines D ₀ ′ to D _k ′.

Accordingly, as shown in FIG. 19, the first detected touch coordinates of the stylus pen 3 using the drive lines D _{0 to} D _n and the sense lines S _{0 to} Sk are _represented by the drive line D _n-3. And D _n−4 and between the sense lines S _k−3 and S _k−4 , six drive lines D _{n−2 to} D _n−7 and a drive line D _k− It is only necessary to output the synchronization signal to only 6 from ₂ ′ to D _k-7 ′.

In the case where the synchronization signal is alternately output to the drive lines D _{0 to} D _n and the drive lines D ₀ ′ to D _k ′, the drive that outputs the synchronization signal after detecting the touch coordinates line _{D n-2} ~D _n-7 or, it is sufficient to output only the synchronization signal to the drive line _{D k-2 '~D k-} 7'.

  By using such a configuration, the stylus pen 3 and the touch panel controller 21 are stably synchronized, and the drive timing of the stylus pen 3 and the touch panel controller 21 that drives the touch panel 2 is synchronized. A touch panel system that can suppress power consumption and can be driven with low power consumption can be realized.

Note that this embodiment, when the drive line D ₀ to D _n and the sense line S ₀ to S _k is the configuration for detecting a touch position while interchange at a predetermined period, a combination of the configuration of the second embodiment described above The first, third, and fourth embodiments described above are combined with a configuration in which the touch position is detected while the drive lines D _{0 to} D _n and the sense lines S _{0 to} S _k are switched at a constant cycle. Of course.

[Summary]
A touch panel system according to an aspect 1 of the present invention includes a touch panel having capacitance respectively formed at intersections of a plurality of first signal lines and a plurality of second signal lines, a touch panel controller, and a pen. A touch panel system for detecting a touch position from a change in capacitance, wherein the touch panel controller includes a pen and a touch panel for each of the plurality of first signal lines and / or each of the plurality of second signal lines. A first synchronization signal for synchronizing with the controller is output, a drive signal is output to one of the first signal line and the second signal line after the first synchronization signal, and the drive signal In response to this, a detection signal for detecting the touch position is read from each of the other of the first signal line and the second signal line. Based on a detection signal for detecting a position, a distance between the pen and the touch panel is calculated during a period in which the drive signal is output. When the distance is less than a predetermined value, the touch panel controller The second synchronizing signal whose driving power is smaller than the driving power when the first synchronizing signal is output, the first signal line and / or the second signal line after the period during which the driving signal is output. It is the structure which outputs.

  According to the above configuration, when the distance between the pen and the touch panel detected by the touch panel controller is less than a predetermined value, the touch panel controller drives when outputting the first synchronization signal. A second synchronization signal whose driving power is lower than the power is output to the first signal line and / or the second signal line after a period during which the driving signal is output.

  Therefore, it is possible to suppress the power consumed when synchronizing the driving timings of the pen and the touch panel controller, and to realize a touch panel system that can be driven with low power consumption.

  In the touch panel system according to the second aspect of the present invention, when the touch panel controller outputs the second synchronization signal, the touch panel controller can detect the second synchronization signal with the pen so as to detect the second synchronization signal. A configuration may be employed in which the second synchronization signal is output to only some selected signal lines in each and / or the plurality of second signal lines.

  According to the above configuration, the second synchronization signal is received in each of the first signal lines and / or each of the plurality of second signal lines so that the second synchronization signal can be detected by the pen. Since it is output only to some selected signal lines, it is possible to suppress the power consumed when synchronizing the driving timing of the pen and the touch panel controller, and to realize a touch panel system that can be driven with low power consumption.

  In the touch panel system according to aspect 3 of the present invention, when the touch panel controller outputs the second synchronization signal, the touch panel in each of the first signal lines and / or each of the second signal lines. The second sync signal may be output only to the first signal line and / or the second signal line adjacent to the position.

  According to the above configuration, the second synchronization signal may be generated by the first signal line and / or the second signal adjacent to the touch position in each of the first signal lines and / or each of the second signal lines. Since the signal is output only to the signal line, it is possible to suppress the power consumed when synchronizing the driving timing of the pen and the touch panel controller, and to realize a touch panel system that can be driven with low power consumption.

  In the touch panel system according to the aspect 4 of the present invention, it is preferable that the voltage value at the rising edge of the second synchronization signal is smaller than the voltage value at the rising edge of the first synchronization signal.

  According to the above configuration, since the voltage value at the rising edge of the second synchronization signal is smaller than the voltage value at the rising edge of the first synchronization signal, when synchronizing the drive timing between the pen and the touch panel controller, A touch panel system that can reduce power consumption and can be driven with low power consumption can be realized.

  In the touch panel system according to aspect 5 of the present invention, it is preferable that an output period of the second synchronization signal is shorter than an output period of the first synchronization signal.

  According to the above configuration, since the output period of the second synchronization signal is shorter than the output period of the first synchronization signal, the synchronization period is shortened.

  When the synchronization period is shortened, the time until the start of the touch detection operation may be set as a waiting time, or the touch detection operation may be set to start immediately without waiting.

  If the waiting time until the start of the touch detection operation is set as a waiting time, an effect of reducing power consumption can be obtained, and if the touch detection operation is set to start immediately without waiting, the touch detection operation An effect of shortening the cycle, that is, an effect of obtaining touch coordinates more frequently can be obtained.

  In the touch panel system according to aspect 6 of the present invention, the predetermined value related to the distance between the pen and the touch panel detects the range of the amplitude of the synchronization signal that can be stably synchronized and the approach of the pen. You may obtain | require from the distance range between the said pen and the said touch panel to perform, or the distance range between the said pen used by touch operation, and the said touch panel.

  According to the above configuration, while stably synchronizing the pen and the touch panel controller, it is possible to suppress power consumption consumed when synchronizing the drive timing of the touch panel controller that drives the pen and the touch panel, A touch panel system that can be driven with low power consumption can be realized.

  In the touch panel system according to aspect 7 of the present invention, the first signal line and / or the second signal line adjacent to the touch position is an amount by which the pen moves before the second synchronization signal is output. It is preferable to be determined by

  According to the above configuration, while stably synchronizing the pen and the touch panel controller, it is possible to suppress power consumption consumed when synchronizing the drive timing of the touch panel controller that drives the pen and the touch panel. A touch panel system that can be driven with low power consumption can be realized.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

  The present invention can be suitably used for a touch panel system including a touch panel, a touch panel controller, and a touch pen.

1 Touch Panel System 2 Touch Panel 3 Stylus Pen (Pen)
4 touch panel controller 4a touch panel controller 4b touch panel controller 4c touch panel controller 5 pen body 5a gripping part 6 pen tip part 6a pen tip cover 6b pen tip axis 6c insulator 6d writing pressure sensor 7 connection switch 8 control circuit 9a operation switching switch 9b operation switching Switch 10 Sense circuit 11 Synchronization signal detection circuit 12 Timing adjustment circuit 13 Drive circuit 14a First operation switch 14b Second operation switch 15 Drive line drive circuit 16 Sense amplifier 17 Timing generator 18 Control unit 18a Control unit 18b Control unit 18c Control unit 19 AD converter 20 Processing unit 21 Touch panel controller 22 Multiplexer 23 Drive line drive circuit 24 Sense amplifier 25 Timing generator Motor 26 the control unit C _nm capacitance D _n driveline (first signal line or the second signal line)
_Sm sense line (first signal line or second signal line)
_Sk sense line (first signal line or second signal line)

Claims (5)

A touch panel having a capacitance formed at each intersection of a plurality of first signal lines and a plurality of second signal lines, a touch panel controller, and a pen, and detecting a touch position from the change in the capacitance Touch panel system,
The touch panel controller outputs a first synchronization signal for synchronizing the pen and the touch panel controller to each of the plurality of first signal lines and / or each of the plurality of second signal lines, and A drive signal is output to one of the first signal line and the second signal line after the first synchronization signal, and the other of the first signal line and the second signal line is matched with the drive signal. From each of them, reading a detection signal for detecting the touch position,
Based on a detection signal for detecting the touch position, a distance between the pen and the touch panel is calculated during a period in which the drive signal is output,
When the distance is less than a predetermined value, the touch panel controller outputs the second synchronization signal whose driving power is smaller than the driving power when the first synchronizing signal is output. A touch panel system which outputs to the first signal line and / or the second signal line after a period.   When the touch panel controller outputs the second synchronization signal, each of the first signal lines and / or each of the second signal lines so that the pen can detect the second synchronization signal. 2. The touch panel system according to claim 1, wherein the second synchronization signal is output to only some of the selected signal lines.   When the touch panel controller outputs the second synchronization signal, the first signal line adjacent to the touch position in each of the first signal lines and / or each of the second signal lines and / or The touch panel system according to claim 1, wherein the second synchronization signal is output only to the second signal line.   4. The touch panel system according to claim 1, wherein a voltage value at the time of rising of the second synchronization signal is smaller than a voltage value at the time of rising of the first synchronization signal. 5.   5. The touch panel system according to claim 1, wherein an output period of the second synchronization signal is shorter than an output period of the first synchronization signal. 6.

Images